(1) Auto-select all text if the DefaultString$ flag is not null.
(2) Make it have an icon in the title bar, from the current window.
(3) Maybe have a Cancel button to the right of the Ok button.
(4) Play the #MB_ICONQUESTION sound to prompt the user.
(5) Support the StringGadget #PB_String_Password flag.
(6) Make it a bit wider to support longer text, maybe double it?
Also, "Ok" should be "OK" to match the Windows standard.
